Presentation
A follow up of a lesion on right femur that was incidentally noted on previous x-ray of the knee.
Patient Data
Age: 16 years
Gender: Male
From the case:
Non-ossifying fibroma - distal femur
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A well-circumscribed lucency in the distal diaphysis of the femur with a thin zone of transition, sclerotic margins and no periosteal reaction.
From the case:
Non-ossifying fibroma - distal femur
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Well defined (1.3 x 1.5 x 7 cm) cortically based focal lesion at the posterolateral aspect of the distal right femoral shaft with heterogenous predominately low T1 and high T2 signal and sclerotic borders. No fluid-fluid levels, no surrounding edema or extraosseous abnormality.
Case Discussion
Non-ossifying fibromas have the following features:
- present in adolescents and young adults
- the commonest location is the femur and tibia
- dia-metaphyseal in location
- eccentric with mild expansion
- well defined lucent lesion with a sclerotic margin
- cortical thinning, but not breach.
Lesions are asymptomatic and are usually an incidental finding. Lesions often spontaneously regress.
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